Keyboard



FIG. 1 is a perspective view of a keyboard showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is an enlarged partial top view of the portion, labeled '8, of the keyboard in FIG. 6.

The dashed broken lines illustrate portions of the keyboard and form no part of the claimed design. 

CLAIM The ornamental design for a keyboard, as shown and described. 